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The bacterium Variovorax paradoxus, grown in a minimal medium in which silk fibroin represents the sole source of carbon and nitrogen, produces an extracellular protease that hydrolyzes fibroin as well as casein and, to a smaller extent, collagen and albumin. The optimal pH for activity was found to be in the acid range (optimum pH 5.8-6.4) and the enzyme activity was stimulated by the addition of...
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